JP2995647B2 - Hot water circulation type heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulation type heating apparatus for circulating hot water heated by a burner for heating, and relates to a hot water circulation type heating apparatus having an expansion tank in a circulation path of the hot water.

[0002]

2. Description of the Related Art In a heating device of this type, an expansion tank is open to the atmosphere, and hot water is constantly evaporated from the expansion tank to reduce the amount of hot water. When the hot water runs out, not only the heating operation becomes impossible, but also the parts such as the heat exchanger heated by the burner deteriorate, so the water level in the expansion tank is detected, and when the water level falls below the predetermined water level, the expansion tank is automatically turned on. Water is being supplied. Further, if the circulation of the hot water is stopped for a long time in a state where the outside air temperature is low as in winter, the hot water may be frozen in the circulation path. Therefore, the hot water is automatically circulated to prevent freezing.

On the other hand, a control device for controlling the operation of such a heating device constantly monitors the occurrence of an abnormality in the heating device,
When an abnormality occurs, the operation of the heating device such as water supply to the expansion tank and circulation of hot water is set to be prohibited.

[0004]

However, when it is determined that an abnormality has occurred even though the abnormality has not occurred due to disturbance such as noise, or it is temporarily determined to be abnormal due to a poor connection of a connector. In the above-described conventional heating device, once it is determined that an abnormality has occurred, the automatic supply of water to the expansion tank and the automatic circulation of hot water are prohibited even if the determination is incorrect due to disturbance such as noise. The risk of freezing of the circuit increases.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has been made to minimize the risk of freezing of the circulation path of the hot water by minimizing the prohibition on the automatic water supply to the expansion tank and the automatic circulation of the hot water. It is intended to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a hot water circulating heating apparatus for circulating hot water heated by a burner for heating, which is provided in a hot water circulation path. In the hot water circulation type heating device that supplies water to the expansion tank when the water level of the expanded expansion tank is lower than the predetermined water level and circulates hot water when the temperature corresponding to the outside air temperature is lower than the predetermined temperature, various abnormalities that occur in the heating device Prohibiting means for detecting water supply to the expansion tank and circulating hot water, and determining the type of the detected abnormality and setting the abnormality in advance as relating to the combustion system of the burner or the circulation system of hot water.
A prohibition canceling unit for canceling the prohibition by the prohibition unit when the abnormality is resolved, except when the abnormality is a fixed abnormality .

[0007]

When the abnormality is detected by noise or the like, the abnormality is not immediately detected. In addition, when it is determined that the connection is abnormal due to a poor connection of the connector or the like, the connection may be restored to the normal state thereafter. Therefore, when the abnormality is not detected and it is determined that the abnormality has been resolved, the supply of water to the expansion tank and the circulation of the hot water, which were prohibited, can be restarted, and the freezing of the circulation system of the hot water is prevented. However, if the type of abnormality is an abnormality set in advance as relating to the combustion system or the hot water circulation system, a serious failure of the heating device may occur if an abnormality actually occurs. Therefore, even if the abnormality is resolved, the inhibition state is maintained as it is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a system (hot water heating apparatus) for performing a hot air heating operation and a reheating of a bath by using a gas water heater 1 to switch between strong and weak. In the case of the hot air heating operation, high-temperature hot water (hereinafter, referred to as primary hot water) is supplied from the gas water heater 1 to the air conditioner A via the outbound path f1, and the room air is heated with the high-temperature hot water to enter the room as hot air. Blow. The air conditioner is provided with a fan for blowing air and a heat exchanger (radiator) located in the air passage of the fan and through which the primary hot water flows. Even so, a proportional control valve for increasing or decreasing the circulation amount of the primary hot water is provided so that the amount of heat given to the blown air from the radiator is kept constant. Note that the amount of heat given to the blown air can be set in two stages, large and small. When set to large, strong heating is performed, and when set to small, weak heating is performed. In this embodiment, a heat exchanger (cooler) (not shown) cooled by a refrigerant is provided upstream of the radiator in the flow direction of the blown air, and can be used as a cooler in summer. It can also be used as a dehumidifier that performs a dehumidification operation without changing the room temperature by simultaneous use. When used as a dehumidifier, the radiator is operated under the same conditions as for weak heating. Then, the condensed water whose temperature has been lowered by the heat of the blast air from the fan by passing through the radiator is returned to the gas water heater 1 via the return path b1. The recirculated condensate is heated again by the gas water heater 1 and sent out as primary hot water from the outgoing path f1, while a part of the condensed water before being heated is transferred to the downstream path of the pump 2 to be described later as secondary hot water in the outward path f2. , And further branched by the separator S into the forward path f3 and the forward path f4. Each outgoing route f3, f4 is both hot water mat Fa
After being supplied to Fb and performing floor heating, it is returned to the gas water heater 1 as condensate through the return path b1. In addition, when performing additional reheating of the bath, a circulation path different from the primary hot water for the air conditioner A and the secondary hot water for the hot water mats Fa and Fb is provided, and the hot water in the bathtub B is returned via the return path b2. The hot water sucked from the bath tub is heated through a liquid-liquid type heat exchanger described later using a part of the primary warm water sucked and sent to the air conditioner A, and the heated hot water is returned into the bath tub through the forward path f5.
In addition, D is a room temperature sensor, which is a room temperature detecting means, which detects the temperature in the room where the hot water mats Fa and Fb are provided.

Referring to FIG. 2, a heat exchanger 11 using a burner 10 as a heat source is provided in gas water heater 1, and hot water circulated by pump 2 is passed through heat exchanger 11 by burner 10. Is heated and becomes primary warm water, and is supplied from the pipe 12 to the outward path f1. The condensed water returned through the return path b1 enters the expansion tank 3 once, and then returns to the pump 2
Is sucked. By the way, the condensate discharged from the pump 2 returns to the heat exchanger 11 through the pipe 13,
Part of the condensed water is diverted to the pipe 14 as secondary hot water and
2 and reaches separator S. In addition, the temperature of the primary hot water is detected by a temperature sensor 5H provided in the pipeline 12,
The temperature of the secondary hot water is measured by a temperature sensor 5L provided in the line 14.
It is detected by. In the separator S, outgoing routes f3 and f4
Are provided with thermal opening / closing valves Va and Vb, respectively, and individually open and close the entrances of the outward routes f3 and f4 to provide the hot water mat F
The supply of the secondary hot water to a · Fb can be cut off. By the way, the on-off valves Va and Vb each include a wax pellet and a heater for heating the wax pellet inside,
The wax enclosed by the slidable piston in the wax pellet is heated by a heater and expanded by heating the piston, and the piston is slid, and the valve rod is pushed by a rod of the wax pellet integrated with the piston to open the valve. Also,
Condensate coming out of the warm water mats Fa and Fb returns to the expansion tank 3 through the return path b1. By the way, the forward path f1 and the return path b1 are communicated with each other by a bypass BP. When the proportional control valve in the air conditioner A is closed to stop the operation of the air conditioner A and operate the floor heating alone, The primary hot water flows directly into the expansion tank 3 through the bypass BP, and a part of the primary hot water flows into the hot water mats Fa and Fb as secondary hot water so that the sole heating of the floor heating can be performed. The expansion tank 3 is provided with an electrode 31 for detecting a high water level and an electrode 32 for detecting a low water level. When the amount of water in the expansion tank decreases and the water surface moves away from the lower end of the electrode 32, Tap water is supplied through the water supply pipe 33 until the water surface comes in contact with the tip of the electrode 31, and even if the water surface in the expansion tank 3 overflows beyond the lower end position of the electrode 31, excess water passes through the drain pipe 34. Water or hot water is drained.

A portion of the primary hot water is piped from the middle of the pipe 12 so as to branch to the liquid-liquid heat exchanger 4. A thermodynamic on-off valve Vc is provided in consideration of durability. The on-off valve Vc is opened only when the hot water in the bathtub B is additionally heated. Hot water in the bathtub B is circulated to the heat exchanger 4 by the pump 40. When adding hot water or filling hot water, hot water is separately supplied from a hot water heater (not shown) via a pipe 41, and The water is supplied into the bathtub B through the exchanger 4 and the forward path f5 and the return path b2. Reference numeral 42 denotes a normally-closed on-off valve, which is opened when hot water is supplied into the bathtub B via the conduit 41, and the hot water passing through the on-off valve 42 is supplied to the backflow prevention device 43 and the flow meter 44. The water is supplied into the bathtub B through the tub. Reference numeral 45 denotes a water flow switch, which detects that hot water from the return path b2 due to the operation of the pump 40 is actually flowing into the heat exchanger 4, and always operates the pump 40 only when there is hot water in the bathtub B. This prevents the pump 40 from being damaged or noise caused by idling. Reference numeral 5 denotes a control device that is operated by operating the remote controller 51. The control device 5 is connected to the electrodes 31 and 32, and is provided in the water supply pipe 33 in accordance with the water level in the expansion tank 3 detected by the electrodes 31 and 32. Opens and closes the electromagnetic on-off valve 33a, supplies gas to the burner 10, and burns the combustion fan 10a.
Is performed.

The gas water heater 1 is installed outdoors, and an outside air temperature thermistor T for detecting the outside air temperature is provided in the gas water heater 1 near the suction port of the combustion fan 10a.
When the outside air temperature falls below the predetermined temperature, there is no problem in a state in which hot water is circulated, that is, in a state in which heating or reheating is performed, but in a state in which hot water is not circulated, the hot water circulation path may freeze. Occurs. Thus, when the outside air temperature falls below the predetermined temperature, the control device 5 ignites the burner 10 and activates the pump 2 to circulate the hot water, albeit little by little, to perform an antifreeze operation so that the hot water circulation path is not frozen. Further, the water level in the expansion tank 3 is determined by the electrode 32.
When the water level falls below the low water level, the water supply operation is performed. However, if an abnormality occurs in the gas water heater 1, the power must be turned off to prohibit the water supply operation and the freezing prevention operation. However, the control device 5 may determine that an abnormality has occurred due to noise or the like even though the abnormality has not actually occurred. If an abnormality has actually occurred, the abnormality detection state is maintained, but the abnormality detection state does not continue in the case of noise or the like. Therefore, when it is determined that an abnormality has occurred, the water supply operation and the antifreeze operation are prohibited, but when the detection of the abnormality is resolved, the prohibition on the water supply operation and the antifreeze operation is released. However, when the type of abnormality is related to the hot water circulation system and the combustion system of the burner, the emphasis was placed on safety and the prohibition on water supply operation and antifreeze operation was not lifted.

As shown in FIG. 3, the control device 5 includes two types of abnormality detecting sections (prohibiting means) 501 and 502, and when it is determined that any of the various sensors has an abnormality, the water supply controlling means is controlled. The operation of the anti-freezing means 503 and the freeze prevention means 504 is prohibited. However, a prohibition canceling unit 502a is added to the abnormality detection unit 502, and when the abnormality detected by the abnormality detection unit 502 is eliminated, the water supply control unit 5
03 and the operation prohibition on the freeze prevention means 504 are released. By the way, the water supply control means 503 controls the opening and closing of the on-off valve 33a based on the detection signals from the electrodes 31 and 32, and the freezing prevention means 504 makes the outside air temperature detected by the outside air temperature thermistor T fall below a predetermined temperature. When lowered, the control units 505, 506, 507, and 508 are operated to perform hot water circulation. The operation of the control device 5 having such a configuration will be described below with reference to FIGS.

Referring to FIG. 4, when the power of gas water heater 1 is turned on (S1), first, an abnormality of various sensors is checked. If an abnormality occurs in various sensors, the subsequent operation is stopped. However, the abnormality is caused by noise or the like, and once the abnormality is detected, the operation is resumed when the abnormality is subsequently resolved. Specifically, the outside temperature thermistor (S2), thermistor 5H (S3), thermistor 5L (S4), electrode 31
-32 (S5)-It is detected whether or not each sensor of the thermocouple 10b (S6) has an abnormality. If there is no abnormality in all the sensors, an abnormality check (S100) for a circulating system of hot water, which will be described later, and a burner An abnormality check (S200) is performed on the combustion system. If an abnormality occurs in at least one sensor, the process waits until the abnormality is resolved. By the way, with respect to the thermistor and the thermocouple in each of the above-mentioned sensors, an abnormality check is made as to whether or not there is a disconnection and whether or not a temperature which cannot be normally detected is detected. For the electrodes 31 and 32, when the water level in the expansion tank 3 is higher than the high water level,
N, when the water level is between the high water level and the low water level, only the electrode 32 is turned on, and when the water level is below the low water level, both the electrodes 31 and 32 are turned off. Therefore, there cannot be a state where only the electrode 31 is turned on, and if it is detected that only the electrode 31 is turned on, it is determined that the electrode is abnormal.

Next, referring to FIG. 5, if the electrode 32 is ON, the water level in the expansion tank 3 is higher than the low water level, so there is no need to supply water, and the state is maintained until the electrode 32 is turned OFF. When the electrode 32 is turned off, the on-off valve 3
3a is opened to start supplying water to the expansion tank 3 (S
101 and S102). Then, within a predetermined time from the start of water supply, for example, within 2 minutes, the water level becomes high and the electrode 31
When it becomes N (S103 / S111), the on-off valve 33a is closed to terminate the water supply (S104). When the water supply is completed, the timer provided in the control device 5 is started (S105), and it is monitored whether the electrode 32 is ON, that is, whether the water level in the expansion tank 3 is higher than the low water level (S105).
106), when the set time of the timer (for example, 64 hours) elapses, the timer is operated again (S107). When the water level falls below the low water level and the electrode 32 is turned off, if the set time of the timer has elapsed at that time (S108), the timer is reset (S109) and water supply is started. If the set time has not elapsed when the electrode 32 is turned off, re-watering is performed only for the first time, but if the electrode 32 is turned off again before the timer elapses, a small amount of water is supplied to the circulation path of hot water. It is determined that leakage has occurred (S110), and the power is turned off (S11).
3). If the electrode 31 does not turn on even after 2 minutes have passed since the start of water supply in S102, that is, if the water level in the expansion tank 3 does not rise to the high water level (YE in S111).
S) After judging that a large amount of water leakage has occurred in the circulation path of the hot water and closing the on-off valve 33a to stop the water supply (S1)
12) Turn off the power (S113).

Next, referring to FIG. 6, the combustion fan 10a
(S201), and if the rotation speed of the combustion fan 10a is normal (YES in S202), the igniter 10c
Is turned on to generate a continuous spark with the burner 10 (S203), and the solenoid valves MV1 and MV2 are opened to start gas supply to the burner 10 (S204). Then, the burner 10 is ignited, and the ignition is performed by the thermocouple 10b.
(YES in S205), the igniter 10
The continuous spark of c is stopped, and the display of combustion is displayed on the remote controller 51 or the like (S206). Thus burner 10
After that, the burner 10 is turned on based on the hot water temperature detected by the temperature sensor 5H or 5L.
Is proportionally controlled (S207). When a safety device (not shown) operates (YES in S208) and the burner 10 misfires (S209), if the number of misfires is, for example, 14 or less, the gas supply is temporarily stopped (S210 / S211).
Returning to step S203, reignition is performed. If the number of misfires exceeds 14 times, it is determined that some abnormality has occurred in the combustion system, and power is turned off without reignition (S210.S
214). If the ignition is not performed even after the igniter 10c is operated and gas is supplied for 4 seconds (S
(NO at 205) After turning off the igniter 10c (S
215) Re-ignition is performed up to three times (S212). If ignition still does not occur, the power supply is turned off as an abnormality of the combustion system.
FF is set (S214). If the rotation speed of the combustion fan 10a is abnormal when the combustion fan 10a is rotated in S201 (S202), the combustion fan 10a is immediately stopped (S213), and the power is turned off (S214).

As described above, except for the case where an abnormality related to the hot water circulation system or the combustion system occurs, once the abnormality is detected, the operation is temporarily prohibited, but when the abnormality is resolved, the operation is automatically restarted. . When an abnormality occurs in the hot water circulation system or the combustion system, the operation is not restarted until the user turns on the power again, so that safety is not reduced.

In the above embodiment, when the outside air temperature is equal to or lower than the predetermined temperature, the burner 10 is ignited and the pump 2 is operated to perform the antifreeze operation. However, only the pump 2 is operated to circulate water. You may make it do. Also,
Detects the temperature of the water in the circuit (temperature corresponding to the outside temperature)
The antifreezing operation may be performed when the water temperature is equal to or lower than a predetermined temperature.

[0018]

As is apparent from the above description, the present invention automatically prohibits the automatic supply of water to the expansion tank and the automatic circulation of hot water when the abnormality is resolved if the abnormality is not related to the combustion system or the hot water circulation system. Since the operation is subsequently canceled and the subsequent operation is performed, the operation prohibition state is minimized and the risk of freezing of the circulation path of the hot water can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection state between a water heater and peripheral devices.

FIG. 2 is a diagram showing a pipe state in a water heater.

FIG. 3 is a block diagram illustrating functions of a control device.

FIG. 4 is a flowchart for checking an abnormality of various sensors.

FIG. 5 is a flowchart for performing an abnormality check on a circulation system of hot water.

FIG. 6 is a flowchart for performing an abnormality check on a combustion system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas water heater 2 Pump 3 Expansion tank 4 (Liquid-liquid type) heat exchanger 5 Controller 10a Combustion fan 10b Thermocouple 10c Igniter 5H Temperature sensor (on high temperature water side) 5L Temperature sensor A (on low temperature water side) A Air conditioner B Bathtub D Room temperature sensor

Claims (1)

(57) [Claims] 1. A hot water circulation type heating device for circulating and heating hot water heated by a burner, wherein when a water level of an expansion tank provided in a circulation path of the hot water is equal to or lower than a predetermined water level, the heating water is supplied to the expansion tank. In the hot water circulation type heating device that circulates hot water when the temperature corresponding to the outside air temperature is equal to or lower than the predetermined temperature while supplying water, various abnormalities occurring in the heating device are detected, and the water supply to the expansion tank and the circulation of the hot water are performed. The prohibition means to be prohibited and the type of detected abnormality are determined, and the abnormality is predicted as relating to the combustion system of the burner or the circulation system of hot water.
And a prohibition canceling means for canceling the prohibition by the prohibiting means when the abnormality is resolved, except when the abnormality is set .